Adjustable pressure indicator for tires



May 19, 1931. c. E. STILLE ADJUSTABLE PRESSURE INDICATOR FOR TIRES Filed 001;. 4. l929 QIIJ I Patented May 19, 1931 COBSVILIQE E. STILLE. OE TUCKAEOE, NEW JERSEY .ADJ'USTAIBLE PRESSURE INDICATOR FOR TIRES Application filed October 4, 1929. Serial No. 397,265.

This invention relates to a pressure gauge for pneumatic tires, the general object of the invention being to provide a gauge which is attached to the rim of the wheel and is not in communication with the tube so that the gauge is always attached to the wheel and t ere is no danger of leakage of the tube as there would be if the gau e was in communication with the interior tliereof.

Another object of the invention is to so construct the gauge that it can be manufactured to sell at low cost, it can be easily and uickly attached to the rim and removed t erefrom without interfering with the use of the rim when removed and one which will permit the condition of inflation of the tire to be ascertained by sight or sense of touch. This invention also consists in certain other features of construction and in the combination and arrangemen parts, to be hereinafter :Eul y described, illustrated in the accompanying drawings and specifically pointed out in the appended claim.

In describing the invention in detail, reference will be had to the accompanying drawings wherein like characters denote like or corresponding parts throughout the several views, and in which r Figure 1 is a sectional view througha portlon of a rim of a wheel and its tire, showing the invention in use.

Figure 2 is a similar view, butshowing the device in operative position by the'infla tion of the tube.

Figure 3 is a sectional view showing a modification.

In these views, the numeral 1 indicates a cylindrical shaped bod having its inner end closed and formed with a fian e so that the bodg can be passed through aliole 2 formed in t e rim 3 of the wheel, with its flange engaglng a part of an inner wall of the rim and 4 indicates a cap threaded on the projecting part of the body and bearing against a. gasket 5 which is placed between the rim and the cap. Thus the parts are fastened to the rim in a leak-proof manner.

A rod 6 asses through-a hole in the closed end of the ody and through a hole in the end of the several of the cap and that end which is located in the space formed by the rim fastened to a diaphragm washer 7 which is placed between the rim and the tube 8 of the tire 9. The rod can be connected with the washer in any desired manner, but the drawings show the reduced end of the rod upset on the washer.

A coil spring 10 is placed in the body and encircles the rod and bears against an adjacent washer of a, number of washers 11 0 placed on the rod, with one of the washers bearing against a collar 12 formed on said rod. This spring 10 tends to counteract movement of the washer 7 b the pressure from the tube so that by placing the proper number of washers 11 between the end of the spring and the collar 12, the pressure at which the tube will compress the diaphragm washer 7 can be regulated.

From the foregoin it will be seen that when the tube 8 is in ated to the degree for which the gauge or indicator is set, the rod 6 will project from the cap so that one can tell approximatel when the tube is properly inflated by eit er sight or touch. If the tube becomes wholl or'partially deflated the diaphragm was or will draw the rod back into the cap, as shown in Figure 1, so one will lmow that the tire needs further inflation. It will, of course, be understood that so if desired, the rod can be graduated to indicate the pressure in the tube, thou h I refer ,to so form the arts that the fact t at t e rod projects from t e device will indicate that the tire is roperly adjusted and that when the rod is ush with the ca that the tire needs further inflation. In t is way, one can tell by the sense of touch whether the tire needs inflation so that he can tell at night the condition of the tire as well as during the day.

As will be seen, the device can be manufactured to sell at low cost, it can be easily installed and when'removed, will not interfere with the use of the rim.

' Figure 3 shows the invention used on a dif- 95 ferent form of rim from that shown in the other views and in this case, the diaphra washer is replaced b a plain washer 7 n other respects, this orm of the invention is 106 the same as that before described.

n is thought mm the foregoing description, that the advantages and novel features of the invention will be readil apparent.

It is to lie-understood that c anges may be made in the construction and in the combination and arrangement of the several parts,

provided that such changes scope of the appended claim.

What I claim is: 1 4

An adjustable pressure indicator for tires fall the comprisin a cylindrical shaped body extending throng a rim and havin one end closed and flanged'to engage one ace of the rim and provided with a centrally arranged opening in theclosed end, a second 0 lindrical shaped body threaded on the first ody and I 'bearin against the opposite face of the rim from t at engaged by the flanged end of the first body an having one end closed and provided with a centrally arranged opening aligping with the first opening, a rod slidable in t e openings, a diaphra member secured to one end of the rod and engaging the pneumatic tube ofa tire mounted on the rim, a disk fixed to the rod within the bodies, a coil spring to counteract the action of the diaphragm member and mounted on the rod between the disk and the closed end of the second body, and adjusting washers on the rod between the disk and one end of the spring to permit varying cf'the' tension of the spring and consequently vary the movement of the rod by the action of the dia hragm member. In testimony whereof I a x m signature.

CORSVIIJLE E. TELE. 

